Catalysts for conversion of methane to higher hydrocarbons

Details Catalysts for conversion of methane to higher hydrocarbons Catalysts for conversion of methane to higher hydrocarbons

1991-05-15

1993-01-05

Pal, Asok

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

By dehydrogenation

585661, 585700, C07C 200

Patent

active

051772949

ABSTRACT:
Catalysts for converting methane to higher hydrocarbons such as ethane and ethylene in the presence of oxygen at temperatures in the range of about 700.degree. to 900.degree. C. are described. These catalysts comprise calcium oxide or gadolinium oxide respectively promoted with about 0.025-0.4 mole and about 0.1-0.7 mole sodium pyrophosphate. A preferred reaction temperature in a range of about 800.degree. to 850.degree. C. with a preferred oxygen-to-methane ratio of about 2:1 provides an essentially constant C.sub.2 hydrocarbon yield in the range of about 12 to 19 percent over a period of time greater than about 20 hours.

REFERENCES:
patent: 4499322 (1985-02-01), Jones et al.
patent: 4886932 (1989-12-01), Leyshon
Kiyoshi Otsuka et al., "Active and selective Catalysts for the Synthesis of C.sub.2 H.sub.2 and C.sub.2 H.sub.6 via Oxidative Coupling of Methane", Journal of Catalysts 100 pp. 353-359 1986.
C. Andrew Jones et al., "The Oxidative Conversion of Methane to Higher Hydrocarbons over Alkali-Promoted Mn/SiO.sub.2 ", Journal of Catalysts 103, pp. 311-319 1987.
Tomoyasu Ito et al., "Oxidative Dimerization of Methane over a Lithium Promoted Magnesium Catalyst", Journal of American Chemical Society 107 pp. 5062-5068 1985.

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